How can you define a route with an optional parameter category that defaults to 'all' if not provided, and use it inside the route callback?

hard📝 Application Q15 of 15

Laravel - Routing

How can you define a route with an optional parameter category that defaults to 'all' if not provided, and use it inside the route callback?

ARoute::get('/items/{category?}', function ($category) { return 'Category: ' . $category; });

BRoute::get('/items/{category}', function () { return 'Category: all'; });

CRoute::get('/items', function ($category = 'all') { return 'Category: ' . $category; });

DRoute::get('/items/{category?}', function ($category = 'all') { return 'Category: ' . $category; });

Step-by-Step Solution

Solution:

Step 1: Define optional parameter in route
Use curly braces with a question mark {category?} to make the parameter optional.
Step 2: Set default value in function
Assign a default value 'all' to $category in the function signature to handle missing parameter.
Final Answer:
Route::get('/items/{category?}', function ($category = 'all') { return 'Category: ' . $category; }); -> Option D
Quick Check:
Optional parameter + default value = Route::get('/items/{category?}', function ($category = 'all') { return 'Category: ' . $category; }); [OK]

Quick Trick: Use {param?} and default value in function for optional params [OK]

Common Mistakes:

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